| abstract |
A polymer dispersant useful for improving the fluidity of cementitious compositions comprises a polyimide or substituted polyamide backbone, of which at least a certain proportion of side chains grafted oligomers or polymer include one or more amides, esters and thioesters, having the general formula: (CF DESIGN IN BOPI) wherein X is at least one of hydrogen, an alkali metal ion, an alkaline earth metal ion, an ammonium ion and an amine; R is at least one of C1-C6 alkyl (ene) ether and mixtures thereof, and (C1-C6 alkyl (en)) imine and mixtures thereof; Q is at least one of oxygen, nitrogen and sulfur; p is a number from 1 to about 300 resulting in at least one of a straight side chain and a branched side chain; R1 is at least one of hydrogen, a C1 to C20 hydrocarbon, and a functionalized hydrocarbon containing at least one of the groups -OH, -COOH, derivative of -COOH, sulphonic acid, derivative of sulphonic acid, amine and epoxy; Y is a hydrophobic hydrocarbon or poly (alkylene oxide) group which has the function of antifoam; m, m ', m ", n, n' and n" are each independently 0 or an integer between 1 and about 20; Z is a group containing at least one group from i) a compound containing at least one amine group and one acid group, ii) two functional groups capable of being incorporated into the backbone, chosen from the group consisting of dianhydrides, dialdehydes and diacid chlorides, and iii) a succinimide residue; and in which a, b, c and d represent the mole fraction of each unit, the sum of a, b, c and d being equal to one, a, b, c and d each being a decimal number of a greater value or equal to zero and less than one, and at least two of a, b, c and d being greater than zero. |